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Scholes, who retired for a second time in 2013, spent his entire club career at United, much of it in the centre of midfield, which is where he now considers Mourinho's side to be at their weakest.

Making a case for the inclusion of his former United team-mate Michael Carrick, who was an unused substitute at Watford, Scholes at the same time suggested Marouane Fellaini was too limited to sit alongside Paul Pogba.

"I thought Fellaini was all right, he does a job which stops the other team. But I think if you're Manchester United you need more than that," Scholes told BT Sport.

"I think you need someone who can stop the play - but he needs to be capable of controlling the game of football as well, playing forward, passing forward.

"As well as he (Fellaini) has done in the first three or four games, I just can't understand why Michael Carrick's here. It looked last year like he was leaving, he's not been involved a minute of the season, so what he's done I don't know.

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"Obviously (Bastian) Schweinsteiger - he (Mourinho) is not keen on him. They need to get a playmaker in there. You're coming to Watford, you're not going to Arsenal."

Scholes saw United repeatedly picked open by Watford, and added: "I expected them to be a lot tighter defensively, especially with bringing Chris Smalling in, but they were all over the place and every time a ball came into the box you felt Watford were going to score.

"Something's not right there. The cohesion of the team isn't there. He (Mourinho) needs to find the right mix of players."